20 STATE HORTICULTURAL COMMISSION. 



Both the wet and the dry sprays, when thoroughly mixed, 

 will be found very efficient in eradicating these pests by either 

 dusting with the dry compound or spraying in the regular 

 manner with the wet solution. 



SQUASH BUG (Anasa triatis)', HARLEQUIN CABBAGE BUG (Mur- 

 gantiahistrionica)', BOX ELDER PLANT BUG (Leptocoris triri.ttatus). 



These insects are too well known to need description. The 

 females, which hibernate during winter in dried leaves and 

 weeds along fences, lay their eggs on the under side of the 

 leaves or on the stems of young plants. To be successful in 

 fighting these pests the hibernating females must be gathered 

 before they lay their eggs, thus preventing the spring brood 

 from making its appearance. This has been done on a large 



FIG.. 20. Harlequin Cabbage Bug (Murgantia histrionica). 



a. Larva, b. Pupa. c. Eggs, natural size. d. Eggs, enlarged, e. Eggs seen from 



above, enlarged. 



scale and is the only true way of preventing the enormous 

 increase which generally occurs where these pests are let alone. 

 In case the spring brood makes its appearance, about the only 

 available method is hand picking or jarring them into recepta- 

 cles containing kerosene. Where the pest is very numerous 

 the planting of early trap crops has also been found quite 

 successful. 



HESSIAN FLY (Cecidomyia destructor}. 



This is one of the pests which, in favorable seasons, appear 

 in our grain fields and it does considerable damage to the grow- 

 ing grain. The adult fly is a small black gnat, resembling 

 somewhat the mosquito on a very small scale. The female 

 deposits her eggs on the leaves and leaf-stalks of the sprouting 

 grain. These eggs, which are very minute, are pale orange in 

 color, with reddish dots, and are laid with the head end 

 downward. As soon as the tiny grub hatches, it goes down the 

 stem and forces itself between the stem and the sheath as near 

 the joint as possible. At this point the grub makes its attack 



